Thank you for the pool and blockcrawler!
Edit mmcfe-ng-path/public/include/smarty_globals.inc.php
replace
$bitcoin->can_connect() === true ? $dNetworkHashrate = $bitcoin->query('getnetworkhashps') : $dNetworkHashrate = 0;
with:
if ($bitcoin->can_connect() === true) {
$dNetworkHashrate = $bitcoin->query('getmininginfo');
if (is_array($dNetworkHashrate) && array_key_exists('networkhashps', $dNetworkHashrate))
$dNetworkHashrate = $dNetworkHashrate['networkhashps'];
}
Then the network hashrate will be available.